Convert Synodic Months to Draconic Months
Convert Synodic Months (syn.mo) to Draconic Months (drac.mo) instantly and accurately.
Conversion Formula
drac.mo = syn.mo × 1.085195874
About Synodic Months
A synodic (lunar) month = new moon to new moon = 29.5306 days = 2,551,442.9 s. Longer than the sidereal month (27.32 d) because Earth advances ~27° in its orbit during that time; the Moon must travel further to realign with the Sun. Islamic Hijri, Hebrew lunisolar, and Chinese calendars are built on synodic months. Eclipses repeat via the Saros cycle (18 yr 11 d = 223 synodic months). 1 syn.mo ≈ 29.5306 d.
About Draconic Months
The draconic (nodical) month = 27.2122 days = 2,351,135.8 s - the interval between successive Moon passages through the same orbital node. Named from the Latin 'draco' (dragon): eclipses only occur near the nodes, where the Moon can align with the Sun or Earth's shadow. The Saros cycle (18 yr 11 d) equals ~242 draconic months, enabling eclipse sequence forecasting. 1 drac.mo = 27.2122 d.
Quick Reference Table
| Synodic Months (syn.mo) | Draconic Months (drac.mo) |
|---|---|
| 1 syn.mo | 1.0852 drac.mo |
| 2 syn.mo | 2.17039 drac.mo |
| 5 syn.mo | 5.42598 drac.mo |
| 10 syn.mo | 10.852 drac.mo |
| 25 syn.mo | 27.1299 drac.mo |
| 50 syn.mo | 54.2598 drac.mo |
| 100 syn.mo | 108.52 drac.mo |